Fix and write unit test.

Steps to Reproduce

• x
  • y

1. Search for y using the search modal
2. Edit y in the search results

Current Behavior

TypeError: Cannot read property 'id' of undefined

Expected Behavior

Should be able to edit y → yo yielding:

• x
  • yo

Editing a context in a search result should modify all ThoughtContexts that it shows up in.

Note

Searching for x and editing x in the search results works fine.